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Property and Equipment (Narratives) (Details) (USD $)	12 Months Ended
Property and Equipment (Narratives) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 6,700,000	$ 6,500,000	$ 5,900,000
Net book value	26,862,000	18,057,000
Software Development
Property, Plant and Equipment [Line Items]
Net book value	12,100,000	8,500,000
Software Development Work-in-Progress
Property, Plant and Equipment [Line Items]
Net book value	$ 7,500,000	$ 3,900,000

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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